发生在

happen by───发生于

happened in───发生在（时间，地点等）

happened on───偶然遇到或发现

happens by───发生在

happening by───发生于

happened───vi.发生（happen的过去式及过去分词）

happened past───曾经发生过

happened upon───偶然发现；偶然碰见

sharpened up───使……更敏锐；认真思考

It was hard to know whether it happened by accident or by design.───很难知道这是偶然发生还是有意为之。

None of this happened by accident.───所有发生的这一切都不仅仅是巧合。

Now, reader, time what happened by your watch.───现在，读者，用你的表来为发生的事情计时吧。

If there was no beginning to time, all things that could happen would have happened by now and the universe would have ended.───如果没有起点计时，能发生现在会发生的所有事并且宇宙会结束。

The confusion arises because each result is tested separately to see how likely, in statistical terms, it was to have happened by chance.───产生误导的原因在于实验通常单独检验一个结果，看其在机遇中有多大产生的可能。

He said he happened by my house and came in.───他说他是偶然路过我家就顺便进来了。

A boy explains what happened by placing his hands over his stomach, indicating that the horse starved to death.───一个男孩把手放在自己的肚子上，以此解释白马的死亡原因，表示它是饿死的。

Population experts said the Unite Nation had thought that would happened by this year.───人口专家说联合国已经想到今年将要发生这种情况。

Eventually, Fragoso hoped to "make sense of what happened" by documenting her life.───最后，弗拉戈索希望通过记录她的生活“弄清楚究竟发生了什么”。

None of this happened by chance and, as always, actions speak louder than words.

Here it probably happened by sailing into the steep wave resulting in a sudden loss of speed.

Cops happened by, two casual burly uniformed cops.

We shall never know whether this happened by accident or by design.

The best foaming condition is happened by adding 7% PYA resin and 4% foaming agent.

Had it happened by accident or by design?

This did not mean she was prepared to throw herself headlong into a relationship with the first half-decent male who happened by.

He said he happened by my house and came in.

And this economic history didn't happen by chance. It happened by choice.